Looper-gage for sewing-machines.



G. BUSCH.

LOOPER GAGE FOR SEWING MACHINES.

APPLlCATlON FILED AUG-29, 1913.

1,23?,746. Patented Aug. 21, 1917.

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GERHABD BUSCI-I, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

. LOOPER-GAGE FOB SEWING-MACHINES.

Specification of Letters Iatcnt.

Patented Aug". 21, 1917.

Application filed August 29, 1913. Serial No. 787,347.

To all whom it may concern:

Be it known that I, GERHARD Boson, a citizen of the United States, residing at Philadelphia, in. the county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Looper-Gages for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

This invention relates to new and useful improvements in looper gages for sewing machines, that is devices which may be used for positioning the looper relative to the needle so that the same will cooperate with the needle in proper timing therewith.

An object of the invention is to provide a gaging device which may be readily manipulated or adjusted to the proper gage of the machine, after which the looper may be positioned relative to the needle at this predetermined position determined by the gage.

In the drawings, which show by way of illustration one embodiment of the invention,

Figure 1 is a plan view showing parts of a sewing machine and the improved gaging device applied thereto for positioning the needle.

. Fig. 2 is a side elevation of the same.

Fig. 3 is a detail in perspective showing the improved looper gaging device. In a chain stitch sewing machine where the looper moves into and out of the needle loo cial y where a thread-carrying looper is employed so a double thread stitch is formed, it is essential that the looper shall be set in proper timing relative to the needle, otherwise there will be a skipping of stitches. Therefore, when each machine is sent out, the proper distance to set the point of the looper from the needle is indicated, that is the distance from the point of the looper to the needle when the needle is at the full lower end of its stroke. If this distance is always maintained, then the looper will with certainty pass into the needle loop and perfect stitchingwill be performed. Although great care in the manufacture of loopers is taken, they sometimes vary slightly in length and, therefore, each machine is provided with means for adjusting the position of the looper carrier relative to its actuating mechr' to form a chain stitch and more espeanism so that the position of the point of the looper relative to the needle, when said needle is at the lower end of its stroke, may be varied.

The present invention consists, generally, in providing a gaging device which may be readily set to the correct distance between the needle and the point of the looper and which may be then subsequently used for adjusting and positioning the looper point relative to the needle.

In the drawings I have shown parts of a Sewing machine and the application of the gaging device for positioning the looper in order to assist in an understanding of the invention. The bed plate of the sewing machine is indicated at 1. The needle 2 reciprocates in the usual manner and is shown in the drawings as at the extreme lower end of its stroke. Cooperating with the needle 2 is a looper 3 which is mounted on a looper carrier 4 pivoted to a looper support 5. This looper carrier 4 is oscillated by a link 6 which is threaded into a coupling attached to a ball stud mounted on the looper carrier at one end and the other end of the link is threaded into a coupling which is connected to a ball stud on a part of the looper actuating mechanism. The thread 7 at one end of the link 6 is oppositely cut from the thread 8 at the other end of the link so that a rotation of the link will draw the coupling 4 toward the coupling at the other end of the link or force the same away therefrom, depending upon the direction of rotation of the link, and this adjustment of link varies the position of the looper relative to the needle. These parts are common to the sewing machine art and form no part of the present invention but have been shown in order that the function of my improved gage may be made clear.

My improved gage, as herein shown, consists of two parts 9 and 10 which are in the form of arms and said parts are pivotally connected at 11 so that the outer ends 12 and 13 of the arms may be moved relative to each other. These arms, or parts, extend to the opposite side of the pivot 11 and one of the arms is formed with a flat segment 14 having an upturned lip 15. The upper face of this segment is formed with a scale. The other arm extends over the scale, as at 17, and the edge 18 cooperates with. the scale. The arm 10 is bent downward, as at 19, so

that the outer end 12 lies in the same plane as the arm 13. The outer end 12 of the arm 10 is formed with a V-shaped notch 20, while the outer end 13 of the arm 9 is provided with a right angle notch 21 formed in the side face thereof.

Let us suppose that it is desired to set the looper in a machine which is designed so that the point of the looper shall be onequarter of an inch from the needle when the needle is at the lower end of the stroke. The arms 9 and 10 of the gage are adjusted to the one quarter inch scale mark and this positions the arms 9 and 10 so that the distance from the center of the V-shaped notch to the Wall of the right angle notch is exactly one quarter of an inch. -The gage is then placed so that the needle engages the V-shaped notch and the link 6 is turned until the point of the looper rests against the wall of the notch 21. This correctly positions the looper and the adjustments may be set so as to hold the looper in its proper position. By shifting the position of the arms relative to each other, the gaging device may be set to any desired predetermined position and used for the setting of the looper relative to the needle in any type of chain stitch machine.

It will be understood from the above description that the scale 16 measures the distance between the center of the V-shaped notch and the gaging surface of the notch 21 and, therefore, measures the distance between the center of the needle and the point of the looper. The arm 18 is cut away at 22 so as to provide a single line adjacent the scale 16. The stop 15 limits the movement of the arms relative to each other.

While I have shown my gaging device as comprising pivoted arms and having notches for positioning the needle and looper, it will be obvious that other forms of devices may be used without departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what I claim is:

1. A looper gage for sewing machines,

including in combination connected parts capable of movement relative to each other, one of said parts having a V-shaped notch adapted to engage the needle and the other part having a gaging surface on its outer face adapted to engage the point of the looper, a scale carried by one of said parts and a cooperating surface carried by the other, said scale being so disposed as to measure the distance between the point of the looper and the center of the needle.

2. A looper gage for sewing machines including in combination gaging arms, means for pivotally connecting said arms, one of said arms having a V-shaped notch adapted to engage the needle, and the other arm having a gaging surface on the .outer face adapted to engage the point of the looper, said arms being extended beyond their pivotal connection and one of the arms being provided with a segment having a scale mark thereon and the other arm having a surface cooperating with said scale to determine the distance between the center of the V-shaped notch and the gaging surface of the other arm. 7

8. A. looper gage for sewing machines including in combination gaging arms, means for pivotally connecting said arms, one of said arms having a V-shaped notch adapted to engage the needle, and the other arm hav ing a gaging surface adapted t fillgzl h point of the looper, said arms being extended beyond their pivotal connectionand one of the arms being provided'with a segment having a scale mark thereon, and the other arm having a surface cooperating with said scale to determine the distance between the center ofthe Vshaped notch and the gaging surface of the other arm, said segment having an upturned portion serving as a stop to limit the movement ofthe arms relative to each other. 7

In testimony whereof, I affix my signa: ture, in the presence of two witnesses.

' GERHARD BUSCH. Witnesses:

R. E. THOMPSON, Jr, Jos. H. MASLAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents. Washington, .D. O. 

